22 Inadvertent start-up of a protection or safeguard system 33 Transition to shutdown state according to the technical operating specifications or accident procedures 6 Event or anomaly specific to the primary or secondary system 2 Occurrence of an internal or external natural hazard (flood, fire, etc.) 38 Design, manufacturing or assembly anomaly 1 Event which caused or could cause multiple failures 391 Non-compliance or event which could lead to non-compliance with technical operating specifications TOTAL 762 33 Reactor trip 236 Other significant events which could affect safety GRAPH Events involving safety in NPPs reported in 2021 1 18 Fault, deterioration or failure which affected a safety function 17 Event actually or potentially affecting the containment of hazardous materials 6 Event which led to or which could have led to the dispersal of hazardous materials 8 Inadvertent start-up of a protection or safeguard system 3 Event concerning on-site transports TOTAL 153 19 Other significant events which could affect safety 79 Event which led to safety limits being exceeded 2 On-site or off-site hazard affecting the availability of important equipment 1 Event affecting a safety function that could be a precursor to an accident GRAPH Events involving safety in BNIs other than NPPs reported in 2021 2 20 Other significant events which could affect the environment 5 Bypassing of normal discharge channels, with a significant impact in terms of radioactive substances 1 Malicious act or attempted act likely to affect the environment 14 Confirmed exceedance of one of the discharge or concentration limits for microbiological substances 5 Discovery of a site significantly polluted by chemical or radioactive materials TOTAL 127 9 Non-compliance with the site or facility waste evaluation 25 Non-compliance with the Order of 31 December 1999 23 Non-compliance with an operational requirement which could lead to a significant impact 25 Bypassing of normal discharge channels, with a significant impact in terms of chemical substances GRAPH Significant environment-related events in BNIs reported in 2021 3 152 ASN Report on the state of nuclear safety and radiation protection in France in 2021 03 – REGULATION OF NUCLEAR ACTIVITIES AND EXPOSURE TO IONISING RADIATION
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